Journal
LIQUID CRYSTALS
Volume 40, Issue 10, Pages 1427-1435Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2013.807942
Keywords
ferroelectric liquid crystals; reflective mode; sensing; effective dielectric tensor
Funding
- Australian government
- Smart Digital Optics
- Hong Kong University of Science and Technology through the Australian Research Council (ARC)
- ARC-Linkage research funding program
- HKUST [CERG 612409, CERG 612310]
- Russian Foundation of Basic Research [12-03-90021-Bel_a, 13-02-00598_a, 13-02-90487_Ukr_f_a]
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We present a detailed theoretical and experimental study of the reflectance response of a deformed-helix ferroelectric (DHF) liquid crystal (LC) cell to an applied voltage under cross-polarisers. Using a model based on the effective dielectric tensor approximation, we derive simple analytical formulas to design a LC cell with maximum modulation depth and optimal linearity of the electro-optical response intensity versus the electric field. Our experimental results show that the cell works at frequencies up to 10 kHz and exhibits excellent linearity, with a total harmonic distortion as low as -70 dB. These findings suggest that DHF-LCs can be exploited to develop simple and accurate optical sensors.
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